More Than One OS On Same Machine?:

How exactly does that work? Two Volumes each with an OS on it (and can an added volume just not have an OS), or can the startup volume be partitioned with two OSs??
And whenever the day comes that I get OSX (either on the same one or another one) can the appearance be set to look like OS Classic?

Hi, In-Correct -
...if my 6gb startup volume isn't large enough for 2 OSs.
Although OSX and OS 9 (Classic) are designed to cohabit the same volume (and shipped that way on those machines which came with both OS's pre-installed), as a practical matter that's difficult to achieve on a small drive.
OSX needs lots of space.
A default install of OSX 10.2 and later can take up as much as 3GB of hard drive space. This can be reduced somewhat during the install process by selecting to not install all the various language versions.
In addition, OSX runs best when about 5GB of space is left unused on the volume - OSX uses that for things like its version of virtual memory and to defrag files on the fly.
It's hard to get a satisfactory install of just OSX on a drive as small as 6GB, especially once you start adding in programs, and want to have Classic (OS 9) also available.
In theory it is possible to have multiple installs of OS 9 and earlier on the same volume - there's ways to manage more than one System Folder so that only one is recognized at any time as being valid for booting by the machine. It is very inconvenient to do that, and can easily lead to a no-boot state or other conflicts.
The practical solution when multiple installs of OS 9 and earlier are needed is to place each on its own volume - this can be done by having multiple hard drives available, or by partitioning a drive, or by a combination of those.
The Mac OS is limited to mounting a max of 20 or 21 volumes at boot time. This is usually enough for most of us. The machine I'm using at the present time has ten volumes (including the boot volume) available to it - internal drive #1 has 4 partitions, internal #2 has 5 partitions, plus one external drive. Frankly, I don't access most of those very frequently.

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